Geometric properties of the Kazhdan–LusztigSchubert basis
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Abstract
We study classes determined by the Kazhdan-Lusztig basis of the Hecke algebra in the K -theory and hyperbolic cohomology theory of flag varieties.We first show that, in K -theory, the two different choices of Kazhdan-Lusztig bases produce dual bases, one of which can be interpreted as characteristic classes of the intersection homology mixed Hodge modules.In equivariant hyperbolic cohomology, we show that if the Schubert variety is smooth, then the class it determines coincides with the class of the Kazhdan-Lusztig basis; this property was known as the smoothness conjecture.For Grassmannians, we prove that the classes of the Kazhdan-Lusztig basis coincide with the classes determined by Zelevinsky's small resolutions.These properties of the so-called KL Schubert basis show that it is the closest existing analogue to the Schubert basis for hyperbolic cohomology; the latter is a very useful testbed for more general elliptic cohomologies.
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